SRR1240-100M Bourns Inductor (Other) In Stock
Bourns SRR1240-100M is a 10 µH shielded SMD power inductor with ferrite core, 0.032 Ω DCR, and a 4949 case size, designed for general-purpose power filtering and DC-DC converter applications. RoHS compliant and Pb-free. From $0.45 in stock worldwide shipping.
- Manufacturer
- Bourns
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- SRR1240-100M Datasheet PDF
- Category
- Inductor
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 10 µH nominal inductance with ±20% tolerance for effective power filtering in DC-DC converter output stages
- Ultra-low 0.032 Ω DC resistance minimizing conduction losses in high-current power rail applications
- Ferrite core construction in compact 4949 (12.4 mm × 12.4 mm) SMD package enabling dense power stage layouts
- Pb-free and RoHS compliant construction meeting modern environmental compliance requirements for global markets
Applications
The SRR1240-100M is a shielded power inductor optimized for DC-DC buck and boost converter output filtering in embedded systems, telecommunications power supplies, and industrial motor drive circuits. Its 10 µH inductance and 0.032 Ω DCR make it suitable for high-efficiency switching regulators operating at frequencies from 100 kHz to several hundred kHz. The compact 4949 SMD footprint allows placement close to switching regulator ICs to minimize PCB trace inductance and improve voltage regulation.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 16Weeks |
| YTEOL | 6.7 |
| Case/Size Code | 4949 |
| Construction | Rectangular |
| Core Material | FERRITE |
| DC Resistance | 0.032Ω |
| Inductance-Nom (L) | 10 µH |
| Inductor Application | POWER INDUCTOR |
| Inductor Type | GENERAL PURPOSE INDUCTOR |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Height | 4mm |
| Package Length | 12.5mm |
| Package Style | SMT |
| Package Width | 12.5mm |
| Packing Method | TR, EMBOSSED, 13 INCH |
| Rated Current-Max | 4A |
| Self Resonance Frequency | 27MHz |
| Shape/Size Description | RECTANGULAR PACKAGE |
| Shielded | YES |
| Surface Mount | YES |
| Terminal Finish | Tin (Sn) - with Nickel (Ni) barrier |
| Terminal Placement | DUAL ENDED |
| Terminal Shape | WRAPAROUND |
| Test Frequency | 0.1MHz |
| Tolerance | 20% |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8504.50.80.00 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SRR1240-100M:
Frequently Asked Questions
What is the inductance value and DC resistance of the SRR1240-100M, and how do these affect power converter efficiency?
The SRR1240-100M has a nominal inductance of 10 µH and an extremely low DC resistance of 0.032 Ω. In a DC-DC buck converter delivering 3A output current, this 0.032 Ω DCR results in only about 0.29 mW of resistive loss, contributing to high conversion efficiency above 90% in typical switching regulator designs.
How does the ferrite core material of the SRR1240-100M influence its performance at switching frequencies above 100 kHz?
The ferrite core provides high magnetic permeability and low core losses at switching frequencies from 100 kHz to 500 kHz, which are typical for modern DC-DC converters. This enables the SRR1240-100M 10 µH inductor to maintain effective energy storage and smooth output ripple current even at elevated switching frequencies, unlike iron powder cores that exhibit higher losses above 200 kHz.
For a 5V to 3.3V buck converter application, how does the 4949 case size of the SRR1240-100M fit into a compact power module?
The 4949 case size corresponds to approximately 12.4 mm × 12.4 mm footprint with a height of around 4 mm to 5 mm, making it one of the larger SMD inductor packages. In a compact 5V to 3.3V buck converter module, this size accommodates the 10 µH inductance needed for ripple currents of 300 mA or less, while fitting within a 20 mm × 20 mm power stage area alongside the switching IC and output capacitors.
What lead time should procurement teams plan for the SRR1240-100M, and what safety stock level is advisable for production runs?
Published factory lead time for the SRR1240-100M is 16 weeks, which is longer than average for SMD inductors. For production runs of 5000 or more boards per quarter, procurement teams should maintain a minimum safety stock of 4 to 6 weeks of consumption — roughly 1000 to 2000 units — to avoid line stoppages caused by this extended 16-week replenishment cycle.
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